I made some weird mistakes with some of the edges that made it impossible to use the bevel modifier. I think I should try to do this excercise again after watching a few more videos
Hey Adrian, still looking good.
Those 'weird' mistakes are probably double Vertices; those are very common, especially with beginners. They are what could be called 'fatal' errors, but luckily very easy to correct. In Edit Mode, Select all Vertices (with A) and then M > Merge > By Distance. For good measure, I'd recommended to press SHIFT+N immediately after that, to re-calculate your Normals.
It has been two weeks since I started this but unfortunately I didn't have much time to finish new exercises. However I finally got around to making the mug from the subdivision-surface modeling chapter.